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Causes of Broken Capillaries on Chest. Constriction of Capillaries. Capillaries are very minute blood vessels which connect arteries to veins. When these narrow or widen quickly, it causes the walls to tear and then blood seeps out. It is manifested in the form of purple or red lines.
Quick Answer. Dilated capillaries are caused by a variety of factors, including radiation, sun damage, pregnancy, unbalanced estrogen levels and rosacea, according to Care Fair. They may also be caused by prescription medications or autoimmune diseases.